Around 130,000 are due to attend the benefit concert on Sunday which will feature performances from other stars including Justin Bieber, Katy Perry, Miley Cyrus and Coldplay.
In this photo taken on Friday, June 2, 2017 provided by the Manchester Evening News, victim of the Manchester concert blast Lily Harrison hugs singer Ariana Grande during her visit to the Royal Manchester Children's Hospital, in Manchester, England.
Proceeds from the concert will go towards the We Love Manchester Emergency Fund, set up by Manchester City Council in partnership with the British Red Cross, to support grieving families and victims of the bombing.
Grande documented one of her visits with an injured fan on Instagram, where she has 107 million Instagram followers.
Ariana Grande brought sunflowers and teddy bears for the injured girls.
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Grande was performing at the Manchester Arena late last month when a bomb detonated near one of the venue's exits, killing 22 victims and injuring more than 100. "It was invaluable. She was so honest".
Other fans also took to social media to share their experiences about the surprise visit. "We won't let hate win", Grande said in a statement. "I'm so proud of you, you are so strong and doing really well", she told an 8-year-old fan. "Never seen jaden so happy!even cried again myself".
Jaden Farrell Mann, a young Manchester survivor, tweeted pictures of the pop star along with the message "I got to meet my queen today".
On Friday police had cordoned off an area in southern Manchester and a bomb-disposal team was called out as a vehicle was removed. He was the 17th person detained in connection with the bombing.
Abedi was born in Manchester to Libyan parents, who moved back to Tripoli in recent years, along with his younger siblings.